Molding machine



Jan 6, 1931. E. WALDMAN 1,787,605

MOLDING MACHINE Filed Jan. 23, 1928 3 Sheets-Sheet. 1

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MOLDING MACHINE Filed Jan. 23, 1928 3 Sheets-Sheet. 5

Mf/vr 776% Patented Jan. 6, 1931 UNITED stares mm OFFICE ERNEST WALJDIVIAN, or cisronao, ILLINOIS MOLDING macrrmn Application filed January 23, 1928, Serial No. 248,713, and inGermany February 8, 1927.

The invention relates to molding machines ducinghollow bodies from plastic material such as hard rubber, clay, candy whistles,

bottles, tubes or the like.

It is an object of the invention to provide a machine ofthe character described which eiiiciently and speedily forms hollow articles.

It is a further object to provide a molding machine wherein a pair of form-c3 1 inders are rotated in opposed directions and cores are reciprocated therebetween, to introduce the plastic material between the cylinders, to permit the material to dry on the cores, and to release the dried and ready article for further conveyance. J

A still further object is to provide the cooperating cores on a rotary wheel having a large diameter as compared with the diameter of the form cylinders so that the cores execute a relative movement with respect to the form holes of said cylinders and thereby ef feet kneading of the plastic material in addition to the introduction of said material in the form holes and also a removal of the finished article. It is a still further object to positively drive the form cylinders and core wheel to rot-ate synchronously so that during the molding operation no leading or lagging of pacts with respect to others can take place.

lVith these and other'objects in View which will become apparent from the following description, the invention comprises the means described.

Fig l is a diagrammatic View of the drive means for the form-cylinders and cores.

Fig. 2 is a section onthe line 22 ofFig. 1.

Fig. 3 is an enlarged section of the core composed of two parts and introduced between the form-cylinders.

Fig. 4 is a viewsimilar to Fig. 3but modified to provide a unitarycore.

5 is section through a candy whistle made with the machine.

Figs 6 is anelevational view of the machine constructed in accordance with my invention. I v

Fig. 7 is asection on'line 77 of Fig. 6.

Fig.8 is a section on line 8-8 of Fig. 7.

Fig. 9 is an elevational section.

Fig. 10 is a fragmentary elevational view to disclose adjusting means for the core carrier.

Fig. 11' FiglO,

. Referring to the drawings, 1 designates the base of themachine on whichare provided bearings 2 in which is journaled a drive shaft The shaft has secured thereto pulleys a and a pinion 5 in mesh with a gear 7 fast on a shaft 6.- On-the other end of the shaft 6 is secured a pinionB inmesh with a gear 10A connectedto a'disc 10 fast on a shaft 9. The shaft-rests in a central bearing 32 at the free end of a horizontal arm 33 which projects from; the frame 34; of the machine. At the other end of the shaft 9 a' disc llis secured to which is connected a gear 11A meshing with an intermediary gear-13 on a stub shaft 12. Thegear 13 meshes with a pinion 14 fast on a shaft-1501 which {is provided one forma section onthe line 11 1 1of cylinder 16 juxtaposed to another form-cylinder 1'1 provided on theshaft 6. The shafts 12 and l5 are journaled in a common bearing p The circumference of the form-cylinders is shaped to provideone-half of the outer form of the article to be produced, so that the two form cylinders define together the outer form of the article such as a candy whistle 30 (Figure 5) as is evident from the detail sections shown in the Figures 3 and 4.

' The rims of discs lO-and 11 are provided with'portsi-n which cores2O and 21 are slidably arranged. The'rimsform closures for the mold cavities of the cylindersand there by prevent lateral egress of the plastic material'. In order to reciprocate the cores cams 22'and'23 areprovided on the frame of the machine The cams are so arranged-that. be-

fore the form-cylinders occupy the position in which theycompletely define the form of the article to be produced, the integral lugs 24 and of the cores 20 and 21 strikethe cams 22 whereby bot-h cores are moved toward each other in the hopper 31. When the two halves" of the forms provided in the cylinders 16 and 17 are completely closed the cores are arranged in concentric relation tothe form thus the' forin-cylinder :17 secured to may Ice-correctly adjusted.

' vYhile the drawing'discloses preferred emprovided and the plastic material is pressed therearound by the rotation of the cylinders. The core remains: incontact with the material in order to permit drying thereof until the lugs 24L and 25 come in contact with the cams 23 and which cams slant inoppositedirection to the cams 22. These cams 23 cause the cores ERNEST VALDMAN.

to be returned to the original position permitting the released candy whistle or the like to drop and tohe receivedin-ahopperor conveyer; 87 (Fig. 6) The cams 23 serve to open the cores whilemoving from position A to position B as shown in Fig. 9-.- The cores remain open until they reach the position C so thatthey clear the stationary arm 33. In the rotary movement to position D'the cores are.

being closed by the cams 22 and they remain closed during the remainder of. the circular movement to afiord the material 'suflicient time for drying. In the modification shown in Figure '4: only one disc 11 is provided and a single core20 is utilized which is reciprocated in a similar mannerasthe two cores" 20 and 21. i

In order to make sure that the form-cyli n ders concentrically surround'thecores,a sultable adjustment'i's provided so that the rel-f ative position between cores and the form open ng 111 the cyhnder'1'6 may be; Varied.

For the adjustment ozt' th e cylinders of the] cylinder l6,-tl1e left and right hand screw 28 is provided which with one end engages a nut 29 secured to a spoke of the disc 10 whereas the other end is threaded intoa nut 29A secured to a spoke of. the gear 10A. If the screw which connects the discandthe gear is loosened and'after theflscrews 88 securing the'gear l'QAthrough slots 39 to the disk 10' have "been loosened thesc'rew 28 is turnedQQ.

then the. gear 10A is slightly rotated and bodiments of; the invention numerous the she-rte, r

changesand alterations may be made without departing from the spirit of the invention.

I, therefore, do not confine'myself to the d etails of construction and arrangement as shown but want to include all revisions,

changes and alterations which fairly fall fined in theappended claim.

I claim: 3 I v r A molding machine includinga pair of cooperating cylinders I having complementary withinthe scope fof the invention'as demold cavities attheir circumferences, a pair 

